Hi guys (&girls;),Yesterday i've bringed back my SY22 from my basement and some of the keys on it are dead.I've downloaded service manual/disassembled it down to the keyboard section, cleaned connectors under the keys etc/closed it up. It's a lil' bit better but some of them are still not playing - what else could be the reason apart from the dirt&dust?Thanks in advance for replying,Matt